<div>
  <input onchange= "angular.element(this).scope().submitAnswer(this)"
         type="file" required>

  <div id="processing-modal" class="modal hide" data-backdrop="false">
    <div class="modal-body">
      <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
      <p>Processing uploaded file: <[filename]></p>
    </div>
  </div>
</div>
